Why does the australian outback receive so little rainfall?

It’s flat. Very flat. And big, too, with a dry, hot center, perfect for forming stationary blocking highs and upper level troughs.  Basically, nothing gets through from west to east without a rare and special authorization, and the once-moist air stagnates and dries out in a baking hot oven. Rain has to sneak its way past, usually by scraping along the southern edge, or by coming in from the north or north-east.

the correct answers are:

a - pacific plate;

it is the biggest oceanic tectonic plate. surrounded on all sides by continental tectonic plates, it is submerging and gradually becoming smaller and smaller.

b - north american plate;

huge continental plate, occupying big portion of the northern hemisphere.

c -eurasian plate;

alongside the north american plate, it is one of the two dominant continental plates in the northern hemisphere.

d - indian plate;

a small continental plate, that has been part of gondwanaland initially, but after the break up of it, moved towards northeast and pushed into the eurasian plate that was once part of laurasia.